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參數(shù)資料
| 型號(hào)： | LM317KSTEEL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3-Terminal Adjustable Regulator |
| 中文描述： | 1.2 V-37 V ADJUSTABLE POSITIVE REGULATOR, MBFM2 |
| 封裝： | METAL CAN, TO-3, 2 PIN |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 917K |
| 代理商： | LM317KSTEEL |
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906357
FIGURE 5.
θ
(
JA)
vs Copper (2 ounce) Area for the
SOT-223 Package
906358
FIGURE 6. Maximum Power Dissipation vs T
AMB
for the
SOT-223 Package
HEATSINKING THE TO-263 PACKAGE
Figure 7
shows for the TO-263 the measured values of
θ
(
J
for different copper area sizes using a typical PCB with 1
ounce copper and no solder mask over the copper area used
for heatsinking.
As shown in
Figure 7
, increasing the copper area beyond 1
square inch produces very little improvement. It should also
be observed that the minimum value of
θ
(
JA)
for the TO-263
package mounted to a PCB is 32°C/W.
906355
FIGURE 7.
θ
(
JA)
vs Copper (1 ounce) Area for the TO-263
Package
As a design aid,
Figure 8
shows the maximum allowable pow-
er dissipation compared to ambient temperature for the
TO-263 device (assuming
θ
(
JA)
is 35°C/W and the maximum
junction temperature is 125°C).
906356
FIGURE 8. Maximum Power Dissipation vs T
AMB
for the
TO-263 Package
HEATSINKING THE TO-252 PACKAGE
If the maximum allowable value for
θ
JA
is found to be
≥
103°
C/W (Typical Rated Value) for TO-252 package, no heatsink
is needed since the package alone will dissipate enough heat
to satisfy these requirements. If the calculated value for
θ
JA
falls below these limits, a heatsink is required.
As a design aid,
Table 1
shows the value of the
θ
of TO-252
for different heatsink area. The copper patterns that we used
to measure these
θ
JA
s are shown at the end of the Application
Notes Section.
Figure 9
reflects the same test results as what
are in
Table 1
.
Figure 10
shows the maximum allowable power dissipation
vs. ambient temperature for the TO-252 device.
Figure 11
shows the maximum allowable power dissipation vs. copper
area (in
2
) for the TO-252 device. Please see AN-1028 for
thermal enhancement techniques to be used with SOT-223
and TO-252 packages.
www.national.com
10
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM317KSTEEL | 制造商:Texas Instruments 功能描述:IC V REG ADJ +1.2/37V TO-3-2 317 |
| LM317KSTEEL/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
| LM317KSTEEL/NOPB | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| LM317KSTEELP+ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3-Terminal Adjustable Regulator |
| LM317K-T30-Y | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH CURRENT 1.3V TO 37V ADJUSTABLE VOLTAGE REGULATOR |
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